Removal of Organic Pollutants by the Use of Iron(III) Hydroxide-Loaded Marble

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Abstract
Iron(III) hydroxide-loaded marble (Fe-marble) was studied as an adsorbent to remove phenolic compounds from aqueous solution. The coordination of ligands with the central metal ion occurs through the phenolic oxygen. Sorption and break-through capacities were determined. The effects of pH and concentration were studied. Adsorption remains unaffected in the 2–6 pH range. Fe-marble exhibits good sorption capacities for phenolic compounds, and the adsorption data follow the Langmuir model as well as the Freundlich model. Some experiments were also performed with a view to recovery phenols and create in-situ regeneration of spent adsorbent column. The phenols adsorbed were quantitatively eluted with 1 M NaOH solution. The column can be used for 4–5 cycles consecutively.